My ipad screen is completely black. We think it may have gotten wet or something, but my son has games on it that he wants me to back up to my computer, however, I have never backed it up so when I plug it in to my computer and go to itunes, it tells me to follow the prompts on the ipad, but that's kind of hard to do when I can't see the screen! Is there any other way to do it? Thanks!